TPS54231
SLUS851–OCTOBER 2008.............................................................................................................................................................................................. www.ti.com
DEVICE INFORMATION
PIN ASSIGNMENTS
8
7
6
5
1
2
3
4
PH
BOOT
VIN
GND
EN
COMP
VSENSE
SS
PIN FUNCTIONS
PIN
DESCRIPTION
NAME
NO.
BOOT
1
A 0.1 µF bootstrap capacitor is required between BOOT and PH. If the voltage on this capacitor falls below the
minimum requirement, the high-side MOSFET is forced to switch off until the capacitor is refreshed.
VIN
EN
2
3
Input supply voltage, 3.5 V to 28 V.
Enable pin. Pull below 1.25 V to disable. Float to enable. Programming the input undervoltage lockout with two
resistors is recommended.
SS
4
5
6
7
8
Slow start pin. An external capacitor connected to this pin sets the output rise time.
Inverting node of the gm error amplifier.
VSENSE
COMP
GND
Error amplifier output, and input to the PWM comparator. Connect frequency compensation components to this pin.
Ground.
PH
The source of the internal high-side power MOSFET.
4
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